WO2010147047A1 - 光学用粘着シート - Google Patents

光学用粘着シート Download PDF

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Publication number
WO2010147047A1
WO2010147047A1 PCT/JP2010/059842 JP2010059842W WO2010147047A1 WO 2010147047 A1 WO2010147047 A1 WO 2010147047A1 JP 2010059842 W JP2010059842 W JP 2010059842W WO 2010147047 A1 WO2010147047 A1 WO 2010147047A1
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WO
WIPO (PCT)
Prior art keywords
sensitive adhesive
adhesive sheet
pressure
meth
optical
Prior art date
Application number
PCT/JP2010/059842
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English (en)
French (fr)
Japanese (ja)
Inventor
馬場紀秀
岸岡宏昭
野中崇弘
夏井正頼
麓弘明
寳田翔
鈴木孝
Original Assignee
日東電工株式会社
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43356367&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2010147047(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to US13/378,958 priority Critical patent/US20120094037A1/en
Priority to CN201080027244.9A priority patent/CN102803419B/zh
Priority to JP2011519745A priority patent/JP6296674B2/ja
Priority to KR1020117030686A priority patent/KR101344590B1/ko
Publication of WO2010147047A1 publication Critical patent/WO2010147047A1/ja
Priority to US13/962,086 priority patent/US20130323437A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C09K2323/057—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852—Adhesive compositions
    • Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
    • Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Definitions

  • the present invention relates to an optical pressure-sensitive adhesive sheet.
  • LCD liquid crystal display
  • input devices used in combination with the display device such as a touch panel
  • an adhesive sheet is used for bonding optical members (for example, see Patent Document 1).
  • a touch panel type is attracting attention, and a capacitive type touch panel is particularly popular.
  • an adhesive layer (a layer made of an adhesive) is used as an insulating layer in addition to the purpose of attaching the transparent member.
  • a capacitive touch panel has a mechanism for sensing when the touch panel is touched with a finger or the like, and the output signal at that position changes, and the amount of change in the signal exceeds a certain threshold. In a capacitive touch panel, if the capacitance value is not stable at a constant value, it may cause a malfunction.
  • a malfunction that may be caused by the pressure-sensitive adhesive layer may occur.
  • malfunction may occur when a signal fluctuates greatly due to noise from the outside of a display device or the like.
  • an object of the present invention is to provide an optical pressure-sensitive adhesive sheet that does not impair the function and characteristics of the optical member even when applied to the optical member, particularly for bonding a transparent member in a capacitive touch panel. Even if it is used, it is providing the optical adhesive sheet which can prevent generation
  • the present inventors use an optical pressure-sensitive adhesive sheet in which the dielectric constant at a frequency of 1 MHz is in a specific range and the dielectric loss tangent at a frequency of 1 MHz is in a specific range.
  • the optical member does not malfunction, the sensitivity required for the optical member is not impaired, and particularly when used in a capacitive touch panel, the capacitive touch panel may malfunction.
  • the present invention has been completed by finding that the sensitivity is not impaired.
  • the present invention is an optical pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer, wherein the dielectric constant at a frequency of 1 MHz is 2 to 8, and the dielectric loss tangent at a frequency of 1 MHz is greater than 0 and 0.2 or less.
  • An optical pressure-sensitive adhesive sheet is provided.
  • the present invention also provides the above optical pressure-sensitive adhesive sheet, wherein the dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz is 60% or more of the dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz.
  • the absolute value of the difference between the dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz and the dielectric loss tangent at a frequency of 1.0 ⁇ 10 4 Hz is 0.15 or less.
  • the present invention also provides the above optical pressure-sensitive adhesive sheet having a thickness accuracy of 10% or less.
  • the present invention also provides the optical pressure-sensitive adhesive sheet, wherein the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer.
  • the present invention also provides a (meth) acrylic acid alkyl ester and / or a (meth) acrylic acid alkoxy ester having an acrylic pressure-sensitive adhesive layer having a linear or branched alkyl group having 1 to 14 carbon atoms.
  • a (meth) acrylic acid alkyl ester and / or a (meth) acrylic acid alkoxy ester having an acrylic pressure-sensitive adhesive layer having a linear or branched alkyl group having 1 to 14 carbon atoms.
  • the above optical pressure-sensitive adhesive sheet comprising an acrylic polymer formed as an essential monomer component as a base polymer.
  • the present invention provides the above optical pressure-sensitive adhesive sheet, wherein the acrylic pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition prepared by an ultraviolet polymerization method by ultraviolet irradiation.
  • the present invention also provides the optical pressure-sensitive adhesive sheet used for bonding members constituting the touch panel.
  • the present invention also provides the optical pressure-sensitive adhesive sheet as described above, wherein the touch panel is a capacitive type.
  • the present invention provides a liquid crystal display device or an input device using the optical adhesive sheet.
  • the optical pressure-sensitive adhesive sheet of the present invention has the above-described configuration, the function and characteristics of the optical member are not impaired even when applied to the optical member. In particular, even when used for bonding a transparent member in a capacitive touch panel, it is possible to prevent malfunction when the touch panel is used.
  • FIG. 1 is a schematic diagram illustrating an example of a capacitive touch panel formed by bonding members using the optical pressure-sensitive adhesive sheet of the present invention.
  • the optical pressure-sensitive adhesive sheet of the present invention has a dielectric constant of 2 to 8 at a frequency of 1 MHz and a dielectric loss tangent at a frequency of 1 MHz of greater than 0 and 0.2 or less.
  • the optical pressure-sensitive adhesive sheet of the present invention is used as an insulator in addition to the purpose of bonding optical members.
  • the optical pressure-sensitive adhesive sheet of the present invention has at least a pressure-sensitive adhesive layer and includes both tape-like and sheet-like forms.
  • the optical pressure-sensitive adhesive sheet of the present invention may be a substrate-less type that does not have a base material (base material layer), or may be a type with a base material that has a base material (base material layer).
  • the single-sided adhesive sheet which has adhesiveness only on one side may be sufficient, and the double-sided adhesive sheet which both surfaces have adhesiveness may be sufficient.
  • the pressure-sensitive adhesive layer that provides the pressure-sensitive adhesive surface may have a single-layer structure or a laminated structure.
  • the “base material (base material layer)” does not include a release liner (separator) that is peeled off when the pressure-sensitive adhesive sheet is used.
  • the optical pressure-sensitive adhesive sheet of the present invention has a viewpoint that does not hinder the function and characteristics of the optical member when applied to an optical member, particularly from the viewpoint of sensing sensitivity and stability when applied to a capacitive touch panel.
  • the dielectric constant at a frequency of 1 MHz is 2 to 8, and preferably the dielectric constant at a frequency of 1 MHz is 2.5 to 6.5.
  • the dielectric constant at a frequency of 1 MHz is less than 2
  • the capacitance value required for touch panel sensing is reduced. This is not preferable because it is easily affected by a noise signal and the ratio of the sensing signal to noise is reduced, and malfunction is likely to occur.
  • the dielectric constant at a frequency of 1 MHz exceeds 8, the capacitance value becomes too large, and the signal is likely to be delayed in time, which is not preferable because the sensitivity of sensing decreases.
  • the optical pressure-sensitive adhesive sheet of the present invention has a dielectric loss tangent of 0.2 or less at a frequency of 1 MHz from the viewpoint of effectively using electrical energy necessary for driving the touch panel, particularly when applied to a capacitive touch panel.
  • the dielectric loss tangent at a frequency of 1 MHz is preferably 0.15 or less (for example, greater than 0 and 0.15 or less).
  • the value of the dielectric loss tangent at a frequency of 1 MHz exceeds 0.2, it is not preferable because the loss of electric energy increases when applied to a capacitive touch panel, and the power consumption required for driving the panel increases.
  • the optical adhesive sheet of the present invention has a dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz having a frequency of 1.0, particularly from the viewpoint of operation stability of the touch panel when applied to a capacitive touch panel. It is preferably 60% or more of the dielectric constant at ⁇ 10 4 Hz, more preferably 70% or more of the dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz.
  • the dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz is less than 60% of the dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz, the frequency of the signal in the touch panel changes greatly due to the influence of noise. Since the dielectric constant changes greatly and the capacitance value also changes greatly, sensing may become unstable and cause malfunction.
  • the dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz and the frequency of 1.0 are particularly used from the viewpoint of operation stability of the touch panel when applied to a capacitive touch panel.
  • the absolute value of the difference from the dielectric loss tangent at ⁇ 10 4 Hz is preferably 0.15 or less, more preferably the dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz and the frequency of 1.0 ⁇ 10 4 Hz.
  • the absolute value of the difference from the dielectric loss tangent is 0.12 or less.
  • Dielectric constant and dielectric loss tangent are obtained according to JIS K 6911.
  • the thickness accuracy is 10% or less with respect to the target thickness, particularly from the viewpoint of operational stability of the touch panel when applied to a capacitive touch panel. Preferably, it is 5% or less. If the thickness accuracy exceeds 10%, for example, the capacitance of the optical pressure-sensitive adhesive sheet may change. Such a change in capacitance becomes a change in output signal when used for a capacitive touch panel, which may cause malfunction.
  • the thickness accuracy is obtained as follows. Five points are set in the longitudinal direction within a range of 50 mm ⁇ 75 mm, and the thickness at each measurement point is measured using a 1/1000 dial gauge at each measurement point. The value obtained by dividing the difference between the maximum thickness and the target thickness by the target thickness as a percentage (see the following formula (1)) and the difference between the minimum thickness and the target thickness A value (see the following formula (2)) obtained by dividing the numerical value divided by the thickness is expressed as a percentage. Then, the absolute value of the former is compared with the absolute value of the latter, and the larger value is set as the thickness accuracy (%). (Maximum thickness ⁇ target thickness) / (target thickness) ⁇ 100 (1) (Minimum thickness-target thickness) / (target thickness) x 100 (2)
  • the optical pressure-sensitive adhesive sheet of the present invention is not particularly limited, but preferably has high transparency from the viewpoint of visibility.
  • the total light transmittance (according to JIS K 7361) in the visible light wavelength region is preferably 90% or more.
  • the haze value (according to JIS K 7136) of the pressure-sensitive adhesive layer of the present invention is preferably 5.0% or less, and more preferably 2.0% or less.
  • the total light transmittance and haze value can be measured using, for example, a haze meter (trade name “HM-150”, manufactured by Murakami Color Research Laboratory).
  • Adhesive layer Although it does not specifically limit as a base polymer in the adhesive which comprises the adhesive layer of the adhesive sheet for optics, for example, well-known adhesive (pressure sensitive adhesive) (for example, acrylic adhesive, rubber adhesive, vinyl) Alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine adhesives, epoxy adhesives, polyether adhesives, etc.) Can be used.
  • a base polymer can be used individually or in combination of 2 or more types.
  • the content of the base polymer in the pressure-sensitive adhesive layer is preferably 60% by weight or more (for example, 60 to 100% by weight) with respect to the total weight of the pressure-sensitive adhesive layer. More preferably, it is 80 to 100% by weight.
  • the base polymer in the known acrylic pressure-sensitive adhesive or polyether pressure-sensitive adhesive can be suitably used as the base polymer, and particularly the base polymer in the acrylic pressure-sensitive adhesive is suitable. Can be used.
  • the base polymer of the polyether pressure-sensitive adhesive is not particularly limited, and examples thereof include a polyoxyalkylene polymer.
  • examples thereof include a polyoxyalkylene polymer.
  • the polyoxyalkylene polymers those having a main chain of the polymer having a repeating unit represented by the following general formula (1) are preferable.
  • R 1 is preferably a linear or branched alkylene group having 1 to 14, more preferably 2 to 4 carbon atoms.
  • the repeating unit represented by the general formula (1) include —CH 2 O—, —CH 2 CH 2 O—, —CH 2 CH (CH 3 ) O—, —CH 2 CH (C 2 H 5 ) O—, —CH 2 C (CH 3 ) 2 O—, —CH 2 CH 2 CH 2 CH 2 O— and the like.
  • the main chain skeleton of the polyoxyalkylene polymer may be composed of only one type of repeating unit, or may be composed of two or more types of repeating units. In particular, from the viewpoints of availability and workability, a polymer having —CH 2 CH (CH 3 ) O— as the main repeating unit is preferred.
  • the main chain of the polymer may contain a repeating unit other than the oxyalkylene group. In this case, the total of oxyalkylene units in the polymer is preferably 80% by weight or more, and particularly preferably 90% by weight or more.
  • the polyoxyalkylene polymer may be a linear polymer or a branched polymer, and may be a mixture thereof, but in order to obtain good adhesion, the linear polymer is 50 It is preferable to contain it by weight% or more.
  • an acrylic polymer as a base polymer of an acrylic adhesive is formed using an acrylic monomer as an essential monomer component.
  • an acrylic monomer a (meth) acrylic acid alkyl ester having a linear or branched alkyl group (hereinafter sometimes referred to simply as “(meth) acrylic acid alkyl ester”), (Meth) acrylic acid alkoxyesters can be preferably used.
  • (meth) acryl means “acryl” and / or “methacryl”, and the same applies to others.
  • the alkyl (meth) acrylate having a linear or branched alkyl group is used as the acrylic monomer
  • the alkyl (meth) acrylate having a linear or branched alkyl group is used.
  • An ester may be used alone, or a (meth) acrylic acid alkyl ester having a linear or branched alkyl group and a (meth) acrylic acid alkoxy ester may be used in combination.
  • the ratio in particular of the (meth) acrylic-acid alkylester which has a linear or branched alkyl group, and a (meth) acrylic-acid alkoxyester is not restrict
  • the (meth) acrylic acid alkyl ester having a group may be more or less than the (meth) acrylic acid alkoxyester, and may be the same.
  • (meth) acrylic-acid alkylester which has said linear or branched alkyl group
  • (meth) acrylic acid methyl (meth) acrylic-acid ethyl, (meth) acrylic-acid propyl Isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, (meth) Isopentyl acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, (meth ) Isononyl
  • the said (meth) acrylic-acid alkylester can be used individually or in combination of 2 or more types. Among them, (meth) acrylic acid alkyl esters having 1 to 14 carbon atoms in the alkyl group are preferable, and (meth) acrylic acid alkyl esters having 1 to 10 carbon atoms in the alkyl group are more preferable.
  • the (meth) acrylic acid alkoxyalkyl ester is not particularly limited.
  • (meth) acrylic acid 2-methoxyethyl, (meth) acrylic acid 2-ethoxyethyl, (meth) acrylic acid methoxytriethylene glycol examples include 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate, and the like.
  • an alkoxyalkyl acrylate is preferable, and 2-methoxyethyl acrylate (2MEA) is particularly preferable.
  • the said (meth) acrylic-acid alkoxyalkylester can be used individually or in combination of 2 or more types.
  • the content of the acrylic monomer is preferably 70% by weight or more (for example, 70 to 100% by weight) with respect to the total amount of the monomer components forming the acrylic polymer, from the viewpoint of adhesiveness of the pressure-sensitive adhesive layer.
  • it is 80% by weight or more (for example, 80 to 100% by weight), and even more preferably 90% by weight or more (for example, 90 to 100% by weight).
  • the monomer component that forms the acrylic polymer that is the base polymer includes the above acrylic monomers ((meth) acrylic acid alkyl ester having a linear or branched alkyl group, (meth) acrylic acid alkoxyalkyl ester).
  • a polar group-containing monomer, a polyfunctional monomer, and other copolymerizable monomers may be included as a copolymerization monomer component.
  • polar group-containing monomers examples include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and other carboxyl group-containing monomers or anhydrides thereof (such as maleic anhydride); (meth) acrylic Hydroxyalkyl (meth) acrylates such as 2-hydroxyethyl acid, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, vinyl alcohol, allyl alcohol Hydroxyl group (hydroxyl group) -containing monomers such as: (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide N-hydro Amide group-containing monomers such as siethylacrylamide; amino group-containing monomers such as aminoethyl
  • the polar group-containing monomer is preferably a carboxyl group-containing monomer or an acid anhydride thereof, a hydroxyl group-containing monomer, an amino group-containing monomer, an amide group-containing monomer, or a heterocyclic ring-containing vinyl monomer, particularly preferably acrylic acid.
  • AA methacrylic acid
  • MAA 2-hydroxyethyl acrylate
  • HHA 6-hydroxyhexyl acrylate
  • 4HBA 4-hydroxybutyl acrylate
  • the content of the polar group-containing monomer is preferably 40% by weight or less (eg, 0.01 to 40% by weight), more preferably 1 to 30% by weight, based on the total amount of monomer components forming the acrylic polymer. .
  • the content exceeds 40% by weight for example, the cohesive force of the pressure-sensitive adhesive layer becomes too high, and the stress relaxation property may be lowered.
  • content is less than 0.01 weight% and is too small the cohesion force of an adhesive layer will fall and adhesive performance will fall.
  • multifunctional monomer examples include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, and neopentyl glycol.
  • the said polyfunctional monomer can be used individually or in combination of 2 or more types.
  • the content of the polyfunctional monomer is 5% by weight or less (for example, 0.001 to 5% by weight) with respect to the total amount of monomer components forming the acrylic polymer.
  • the content exceeds 5% by weight, the cohesive force of the pressure-sensitive adhesive layer becomes too high, and the stress relaxation property may be lowered.
  • copolymerizable monomers other than the above polar group-containing monomers and polyfunctional monomers
  • examples of copolymerizable monomers (other copolymerizable monomers) other than the above polar group-containing monomers and polyfunctional monomers include cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, and the like.
  • the acrylic polymer as the base polymer can be prepared by polymerizing the above monomer components by a known or conventional polymerization method.
  • the polymerization method of the acrylic polymer include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method by active energy ray irradiation (an active energy ray polymerization method and a photopolymerization method).
  • the solution polymerization method and the active energy ray polymerization method are preferable in terms of transparency, water resistance, cost, and the like, and particularly when forming a relatively thick pressure-sensitive adhesive layer, the active energy ray polymerization method is preferable.
  • An ultraviolet polymerization method by ultraviolet irradiation is preferred.
  • Examples of active energy rays irradiated during active energy ray polymerization include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, and electron beams, and ultraviolet rays. Is preferred.
  • the irradiation energy, irradiation time, irradiation method, and the like of the active energy ray are not particularly limited as long as the photopolymerization initiator can be activated to cause the monomer component to react.
  • solvents include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane and methylcyclohexane Organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone.
  • a solvent can be used individually or in combination of 2 or more types.
  • a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) can be used depending on the type of the polymerization reaction.
  • a polymerization initiator can be used individually or in combination of 2 or more types.
  • the photopolymerization initiator is not particularly limited, and examples thereof include benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, ⁇ -ketol photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, and photopolymerization initiators.
  • An active oxime photopolymerization initiator, a benzoin photopolymerization initiator, a benzyl photopolymerization initiator, a benzophenone photopolymerization initiator, a ketal photopolymerization initiator, a thioxanthone photopolymerization initiator, and the like can be used.
  • benzoin ether photopolymerization initiator examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one. And anisole methyl ether.
  • acetophenone photopolymerization initiator examples include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 4-phenoxydichloroacetophenone, and 4- (t-butyl). Examples include dichloroacetophenone.
  • Examples of the ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1- [4- (2-hydroxyethyl) phenyl] -2-methylpropan-1-one, and the like.
  • Examples of the aromatic sulfonyl chloride photopolymerization initiator include 2-naphthalenesulfonyl chloride.
  • Examples of the photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime.
  • Examples of the benzoin photopolymerization initiator include benzoin.
  • Examples of the benzyl photopolymerization initiator include benzyl.
  • benzophenone-based photopolymerization initiator examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexyl phenyl ketone, and the like.
  • ketal photopolymerization initiator examples include benzyl dimethyl ketal.
  • thioxanthone photopolymerization initiator examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone, and the like.
  • the amount of the photopolymerization initiator used is not particularly limited, but is preferably 0.005 to 1 part by weight with respect to 100 parts by weight of the total amount of monomer components forming the acrylic polymer, for example.
  • a photoinitiator can be used individually or in combination of 2 or more types.
  • thermal polymerization initiator examples include azo polymerization initiators [for example, 2,2′-azobisisobutyronitrile, 2,2′-azobis-2-methylbutyronitrile, 2,2′-azobis ( 2-methylpropionic acid) dimethyl, 4,4'-azobis-4-cyanovaleric acid, azobisisovaleronitrile, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [2 -(5-Methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) disulfate, 2,2'-azobis (N, N'-dimethylene) Isobutylamidine) dihydrochloride, etc.], peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate, etc.), redox Scan type polymerization initiators and the like.
  • a crosslinking agent may be used for the pressure-sensitive adhesive layer of the optical pressure-sensitive adhesive sheet.
  • a crosslinking agent is used, the acrylic polymer can be crosslinked and the cohesive force of the pressure-sensitive adhesive layer can be further increased.
  • the cross-linking agent is not particularly limited, and conventionally known ones can be widely used.
  • an isocyanate cross-linking agent or an epoxy cross-linking agent can be preferably used.
  • a crosslinking agent can be used individually or in combination of 2 or more types.
  • isocyanate crosslinking agent examples include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, Cycloaliphatic polyisocyanates such as isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'- Aromatic polyisocyanates such as diphenylmethane diisocyanate and xylylene diisocyanate, and the like, and other trimethylolpropane / tolylene diisocyanate adducts [manufactured by Nippon Polyurethane Industry Co., Ltd., Name "Coronate L"], trimethylolpropane /
  • epoxy-based crosslinking agent examples include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, , 6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, Pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyg In addition to cisidyl ether,
  • the amount of the crosslinking agent to be used is not particularly limited, and is usually preferably 0.001 to 20 parts by weight, more preferably 0.01 to 10 parts by weight with respect to 100 parts by weight of the acrylic polymer. .
  • the amount of the isocyanate crosslinking agent used is preferably 0.01 to 20 parts by weight, more preferably 0.01 to 3 parts by weight with respect to 100 parts by weight of the acrylic polymer. is there.
  • the amount of the epoxy crosslinking agent used is preferably 0.001 to 5 parts by weight, more preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the acrylic polymer. is there.
  • a crosslinking accelerator for example, rosin derivative resin, polyterpene resin, petroleum resin, oil-soluble phenol resin, etc.
  • a tackifier for example, rosin derivative resin, polyterpene resin, petroleum resin, oil-soluble phenol resin, etc.
  • anti-aging agent for example, anti-aging agent, and filling are added as necessary.
  • Known additives such as additives, colorants (pigments, dyes, etc.), UV absorbers, antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, etc. It can be used in a range that does not exist.
  • the method for forming the pressure-sensitive adhesive layer of the optical pressure-sensitive adhesive sheet of the present invention can be a known and commonly used method for forming a pressure-sensitive adhesive layer, and differs depending on the polymerization method of the base polymer and is not particularly limited. The following methods are mentioned.
  • a composition containing an additive such as a mixture of monomer components (monomer mixture) forming a base polymer (for example, an acrylic polymer) or a partial polymer thereof and, if necessary, a photopolymerization initiator ,
  • An active energy ray-curable pressure-sensitive adhesive composition is applied (coated) on a substrate or a release liner, and irradiated with active energy rays to form a pressure-sensitive adhesive layer.
  • a heating / drying step may be provided as necessary.
  • the “monomer mixture” means a mixture composed only of monomer components forming the base polymer.
  • the “partially polymerized product” means a composition in which one or more components among the components of the monomer mixture are partially polymerized.
  • the “pressure-sensitive adhesive composition” includes the meaning of “composition for forming a pressure-sensitive adhesive layer”.
  • a known coating method can be used for coating (coating) in the method for forming the pressure-sensitive adhesive layer, and a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, or a dip coater can be used.
  • a roll coater, bar coater, knife coater, spray coater, comma coater, direct coater or the like can be used.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 5 to 500 ⁇ m, and preferably 10 to 250 ⁇ m.
  • the substrate is not particularly limited, and examples thereof include various optical films such as a plastic film, an antireflection (AR) film, a polarizing plate, and a retardation plate. It is done.
  • AR antireflection
  • the material such as the plastic film examples include polyester resins such as polyethylene terephthalate (PET), acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate, triacetyl cellulose, polysulfone, polyarylate, and trade name “ARTON ( Plastic materials such as cyclic olefin polymers such as “Cyclic olefin polymer; manufactured by JSR)” and trade name “Zeonor (Cyclic olefin polymer; manufactured by Nippon Zeon Co., Ltd.)”.
  • a plastic material can be used individually or in combination of 2 or more types.
  • base material is a portion that is attached to the adherend together with the adhesive layer when the optical adhesive sheet is used (attached) to the adherend (optical member or the like).
  • a release liner (separator) that is peeled off when the optical pressure-sensitive adhesive sheet is used (attached) is not included in the “substrate”.
  • a transparent base material is preferable from the viewpoint of obtaining high transparency with an optical pressure-sensitive adhesive sheet.
  • the “transparent substrate” is preferably a substrate having a total light transmittance (according to JIS K 7361) in the visible light wavelength region of 85% or more, more preferably 90% or more.
  • non-oriented films such as PET film and brand name "Arton”, brand name "Zeonor", are mentioned.
  • the thickness of the substrate is not particularly limited and is preferably 12 to 50 ⁇ m, for example.
  • the said base material may have any form of a single layer and a multilayer.
  • the substrate surface may be subjected to appropriate known or conventional surface treatments such as physical treatment such as corona discharge treatment and plasma treatment, and chemical treatment such as undercoating treatment.
  • the base material may be an optical member. That is, the optical pressure-sensitive adhesive sheet of the present invention may be composed of a base material made of an optical member and a pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive layer surface (pressure-sensitive adhesive surface) of the optical pressure-sensitive adhesive sheet of the present invention may be protected by a release liner (separator) until use.
  • Each pressure-sensitive adhesive surface of the optical pressure-sensitive adhesive sheet may be protected by two release liners, or may be wound in a roll by one release liner having both surfaces as release surfaces. It may be protected.
  • the release liner is used as a protective material for the pressure-sensitive adhesive layer, and is peeled off when it is attached to an adherend.
  • the optical pressure-sensitive adhesive sheet of the present invention is a substrate-less double-sided pressure-sensitive adhesive sheet
  • the release liner also serves as a support for the pressure-sensitive adhesive layer. Note that the release liner is not necessarily provided.
  • a conventional release paper or the like can be used, and is not particularly limited.
  • a substrate having a release treatment layer a low adhesive substrate made of a fluorine-based polymer, or a low adhesive group made of a nonpolar polymer.
  • a material etc. can be used.
  • the plastic film, paper, etc. which were surface-treated with peeling processing agents such as a silicone type, a long-chain alkyl type, a fluorine type, and molybdenum sulfide, are mentioned, for example.
  • fluorine-based polymer in the low-adhesive substrate made of the above-mentioned fluorine-based polymer examples include, for example, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene / hexafluoropropylene copolymer, Examples include chlorofluoroethylene / vinylidene fluoride copolymer.
  • nonpolar polymer in the low-adhesive substrate made of the nonpolar polymer include olefin resins (for example, polyethylene, polypropylene, etc.).
  • the release liner can be formed by a known or common method. Further, the thickness of the release liner is not particularly limited.
  • the optical pressure-sensitive adhesive sheet of the present invention has a pressure-sensitive adhesive layer that acts as an insulating layer and suppresses changes in electrostatic capacity due to changes in signal frequency and changes in environment (temperature, humidity). In addition, such an adhesive layer has excellent thickness accuracy. Furthermore, the optical pressure-sensitive adhesive sheet of the present invention is also excellent in transparency.
  • the optical pressure-sensitive adhesive sheet of the present invention is used in applications for bonding optical members (for optical member bonding), optical product manufacturing applications, and the like.
  • the optical member is a member having optical properties (for example, polarization, light refraction, light scattering, light reflection, light transmission, light absorption, light diffraction, optical rotation, visibility, etc.).
  • optical properties for example, polarization, light refraction, light scattering, light reflection, light transmission, light absorption, light diffraction, optical rotation, visibility, etc.
  • apparatuses optical apparatus
  • display apparatus image display apparatus
  • input device or these apparatuses.
  • a polarizing plate for example, a wave plate, a retardation plate, an optical compensation film, a brightness enhancement film, a light guide plate, a reflection film, an antireflection film, a transparent conductive film (such as an ITO film), a design film, a decorative film
  • a transparent conductive film such as an ITO film
  • a surface protective film for example, a prism, a lens, a color filter, a transparent substrate, and a member in which these are laminated.
  • said "plate” and “film” shall each also include forms, such as plate shape, film shape, and sheet shape, for example, "polarizing plate” shall also include “polarizing film” and "polarizing sheet”.
  • Examples of the display device include a liquid crystal display device, an organic EL (electroluminescence) display device, a PDP (plasma display panel), and electronic paper.
  • Examples of the input device include a touch panel (particularly a capacitive touch panel).
  • the optical pressure-sensitive adhesive sheet of the present invention is preferably used for applications such as bonding members constituting a capacitive touch panel.
  • the optical member is not particularly limited, and examples thereof include members made of acrylic resin, polycarbonate, polyethylene terephthalate, glass, metal thin film (for example, sheet-like, film-like, and plate-like members).
  • the “optical member” in the present invention is a member (design film, decorative film, or surface protection) that plays a role of decoration or protection while maintaining the visibility of a display device or an input device as an adherend. Film etc.).
  • the mode of bonding of the optical member by the optical pressure-sensitive adhesive sheet of the present invention is not particularly limited.
  • the optical pressure-sensitive adhesive sheet of the present invention is preferably an optical pressure-sensitive adhesive sheet whose base material is an optical member (such as an optical film including a polarizing film).
  • a pressure-sensitive adhesive layer (preferably the pressure-sensitive adhesive layer of the present invention) is formed on at least one surface of the optical member. It is possible to obtain an adhesive optical member having
  • FIG. 1 shows a schematic diagram of an example of a capacitive touch panel formed by bonding members using the optical pressure-sensitive adhesive sheet of the present invention.
  • 1 is a capacitive touch panel
  • 11 is a transparent protective lens
  • 12 is an optical adhesive sheet
  • 13a is an ITO glass substrate
  • 13b is an ITO film (transparent conductive film).
  • 14 are liquid crystal displays.
  • the capacitive touch panel 1 has a “transparent protective lens 11” and an “ITO glass substrate 13a on which both ITO films 13b are provided” bonded together via an optical adhesive sheet 12.
  • the ITO glass substrate 13 a provided with the film 13 b on both sides and the“ liquid crystal display 14 ”are bonded together via the optical adhesive sheet 12.
  • the capacitive touch panel 1 a type in which the ITO film 13b is provided on both surfaces of the ITO glass substrate 13a is used.
  • the capacitive touch panel has an ITO film on one side of the ITO glass substrate. The provided type may be used.
  • Such a capacitive touch panel has an adhesive layer as an insulating layer made of an optical adhesive sheet, and the adhesive layer is an electrostatic capacity that accompanies changes in signal frequency and environment (temperature, humidity). Since the change is small and stable, the sensitivity is good and the operation is stable. Moreover, since the optical adhesive sheet has high transparency, it is excellent in visibility.
  • the optical pressure-sensitive adhesive sheet is used for an optical device.
  • the optical pressure-sensitive adhesive sheet is used, for example, for bonding members constituting optical devices or members used in these devices.
  • the sensitivity is good, the operation stability is excellent, and the visibility is also excellent.
  • optical apparatus examples include a liquid crystal display device, an organic EL (electroluminescence) display device, a PDP (plasma display panel), a display device (image display device) such as electronic paper, and a touch panel (particularly a capacitive touch panel).
  • a liquid crystal display device an organic EL (electroluminescence) display device, a PDP (plasma display panel), a display device (image display device) such as electronic paper, and a touch panel (particularly a capacitive touch panel).
  • Example 1 (Preparation of photopolymerizable composition) 2-ethylhexyl acrylate 40 parts by weight, 2-methoxyethyl acrylate 59 parts by weight, 4-hydroxybutyl acrylate 1 part by weight, 2,2-dimethoxy-1,2-diphenyl-1-one (trade name “Irgacure 651” Ciba 0.05 parts by weight of Japan) and 0.05 part by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (trade name “Irgacure 184” manufactured by Ciba Japan) were placed in a four-necked flask under a nitrogen atmosphere.
  • Irgacure 651 Ciba 0.05 parts by weight of Japan
  • Irgacure 184 1-hydroxy-cyclohexyl-phenyl-ketone
  • a partially polymerized product (monomer syrup) having a polymerization rate of 10% was obtained by partial photopolymerization by exposure to ultraviolet rays.
  • an isocyanate compound trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd., solid content: 75% by weight
  • a photopolymerizable composition was prepared.
  • the photopolymerizable composition is applied to a release surface of a 75 ⁇ m-thick polyester film having one side peeled with silicone to form a coating layer having a thickness of 150 ⁇ m, and one side is peeled with silicone on the coating layer. Adjust the lamp height so that the treated surface of the polyester film with a thickness of 38 ⁇ m is pasted, and the intensity of the irradiated surface directly below the lamp is 5 mW / cm 2 from the surface on the polyester film side with a thickness of 38 ⁇ m.
  • the black light was irradiated with ultraviolet rays. Polymerization was performed until 3600 mJ / cm 2 was irradiated with the light amount to produce an acrylic pressure-sensitive adhesive sheet having a thickness of 150 ⁇ m.
  • Example 2 (Preparation of photopolymerizable composition) 69 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of 2-methoxyethyl acrylate, 1 part by weight of 4-hydroxybutyl acrylate, 3 parts by weight of acrylic acid, 2,2-dimethoxy-1,2-diphenyl-1-one (trade name) 0.05 parts by weight of “Irgacure 651” manufactured by Ciba Japan) and 0.05 parts by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (trade name “Irgacure 184” manufactured by Ciba Japan) are added to a four-necked flask.
  • the polymer was partially exposed to ultraviolet light under a nitrogen atmosphere and partially photopolymerized to obtain a partially polymerized product (monomer syrup) having a polymerization rate of 10%. After adding 0.01 parts by weight of trimethylolpropane triacrylate to 100 parts by weight of this partial polymer, they were uniformly mixed to prepare a photopolymerizable composition.
  • the photopolymerizable composition is applied to a release surface of a 75 ⁇ m-thick polyester film having one side peeled with silicone to form a coating layer having a thickness of 150 ⁇ m, and one side is peeled with silicone on the coating layer.
  • the lamp height was adjusted so that the intensity of the irradiated surface directly below the lamp from the surface on the 38 ⁇ m thick polyester film side was 5 mW / cm 2 .
  • Ultraviolet rays were irradiated with a black light. Polymerization was performed until 3600 mJ / cm 2 was irradiated with the light amount to produce an acrylic pressure-sensitive adhesive sheet having a thickness of 150 ⁇ m.
  • Example 3 (Preparation of photopolymerizable composition) 68 parts by weight of 2-ethylhexyl acrylate, 24 parts by weight of 2-methoxyethyl acrylate, 6 parts by weight of N-vinylpyrrolidone, 2 parts by weight of hydroxyethylacrylamide, 2,2-dimethoxy-1,2-diphenyl-1-one (trade name) 0.05 parts by weight of “Irgacure 651” manufactured by Ciba Japan) and 0.05 parts by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (trade name “Irgacure 184” manufactured by Ciba Japan) are added to a four-necked flask.
  • the polymer was partially exposed to ultraviolet light under a nitrogen atmosphere and partially photopolymerized to obtain a partially polymerized product (monomer syrup) having a polymerization rate of 10%. After adding 0.015 part by weight of trimethylolpropane triacrylate to 100 parts by weight of this partial polymer, they were uniformly mixed to prepare a photopolymerizable composition.
  • the photopolymerizable composition is applied to a release surface of a 75 ⁇ m-thick polyester film having one side peeled with silicone to form a coating layer having a thickness of 150 ⁇ m, and one side is peeled with silicone on the coating layer.
  • the light was irradiated with ultraviolet rays. Polymerization was performed until 3600 mJ / cm 2 was irradiated with the light amount to produce an acrylic pressure-sensitive adhesive sheet having a thickness of 150 ⁇ m.
  • Example 4 (Preparation of photopolymerizable composition) 70 parts by weight of 2-ethylhexyl acrylate, 26 parts by weight of N-vinylpyrrolidone, 4 parts by weight of hydroxyethylacrylamide, 2,2-dimethoxy-1,2-diphenyl-1-one (trade name “Irgacure 651” manufactured by Ciba Japan ) 0.05 parts by weight and 1-hydroxy-cyclohexyl-phenyl-ketone (trade name “Irgacure 184”, manufactured by Ciba Japan Co., Ltd.) are put into a four-necked flask and exposed to ultraviolet light in a nitrogen atmosphere.
  • a partial polymer (monomer syrup) having a polymerization rate of 10% was obtained. After adding 0.015 part by weight of trimethylolpropane triacrylate to 100 parts by weight of this partial polymer, they were uniformly mixed to prepare a photopolymerizable composition.
  • the photopolymerizable composition is applied to a release surface of a 75 ⁇ m-thick polyester film, one side of which has been release-treated with silicone, to form a coating layer having a thickness of 180 ⁇ m.
  • the light was irradiated with ultraviolet rays. Polymerization was performed until 3600 mJ / cm 2 was irradiated with the light amount to produce an acrylic pressure-sensitive adhesive sheet having a thickness of 180 ⁇ m.
  • Example 5 28 parts by weight of 2-ethylhexyl acrylate, 64 parts by weight of ethyl acrylate, 5 parts by weight of methyl methacrylate, 0.4 parts by weight of azobisisobutyronitrile, and 100 parts by weight of ethyl acetate were put into a four-necked flask and a nitrogen atmosphere 1 part by weight of an isocyanate compound (trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd., solid content: 75% by weight) in an acrylic polymer solution obtained by reaction at about 60 ° C.
  • an isocyanate compound trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd., solid content: 75% by weight
  • Dielectric constant, dielectric loss tangent Dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz, dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz, dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz, dielectric at a frequency of 1.0 ⁇ 10 4 Hz
  • the tangent was measured under the following conditions in accordance with JIS K 6911. Measurement method: Capacity method (apparatus: using Agilent Technologies 4294A Precision Impedance Analyzer) Electrode configuration: 12.1 mm ⁇ , 0.5 mm thick aluminum plate Counter electrode: 3 oz copper plate Measurement environment: 23 ⁇ 1 ° C., 52 ⁇ 1% RH
  • [A] is a dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz
  • [B] is a dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz
  • [C] is a frequency of 1.0.
  • [D] is the dielectric loss tangent at a frequency of 1.0 ⁇ 10 4 Hz.
  • the dielectric constant at a frequency of 1.0 ⁇ 10 4 Hz is 100%.
  • the percentage (%) of the dielectric constant at a frequency of 1.0 ⁇ 10 6 Hz was obtained from the following formula.
  • the dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz and the measured value of the dielectric loss tangent at a frequency of 1.0 ⁇ 10 4 Hz were determined.
  • the absolute value of the difference between the dielectric loss tangent at a frequency of 1.0 ⁇ 10 6 Hz and the dielectric loss tangent at a frequency of 1.0 ⁇ 10 4 Hz is shown in the column “[C] ⁇ [D]” in Table 1. Indicated.
  • the thickness accuracy was determined as follows. Five points are set in the longitudinal direction within a range of 50 mm ⁇ 75 mm, and the thickness at each measurement point is measured using a 1/1000 dial gauge at each measurement point. The value obtained by dividing the difference between the maximum thickness and the target thickness by the target thickness as a percentage (see the following formula (1)) and the difference between the minimum thickness and the target thickness A value (see the following formula (2)) obtained by dividing the numerical value divided by the thickness is expressed as a percentage. Then, the absolute value of the former is compared with the absolute value of the latter, and the larger value is set as the thickness accuracy (%). (Maximum thickness ⁇ target thickness) / (target thickness) ⁇ 100 (1) (Minimum thickness-target thickness) / (target thickness) x 100 (2)
  • a capacitive touch panel as shown in FIG. 1 was produced.
  • the capacitive touch panel using the example is excellent in sensing sensitivity and stability and causes malfunction. There was no thing.
  • the optical pressure-sensitive adhesive sheet of the present invention is used in applications for bonding optical members (for optical member bonding), optical product manufacturing applications, and the like.
  • it is preferably used for applications such as bonding members constituting a capacitive touch panel.

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PCT/JP2010/059842 2009-06-18 2010-06-10 光学用粘着シート WO2010147047A1 (ja)

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Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN102803419A (zh) 2012-11-28
KR101344590B1 (ko) 2013-12-26
JPWO2010147047A1 (ja) 2012-12-06
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US20130323437A1 (en) 2013-12-05
US20120094037A1 (en) 2012-04-19
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JP2018021190A (ja) 2018-02-08
TWI441891B (zh) 2014-06-21
JP2018199817A (ja) 2018-12-20

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